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The carbon one is waaaay better imo, the standard cup one looks really cheap. They're £140 for the plastic one from renault iirc, and the carbon one is about £110 from k-tec.
The wiring is there iirc, you can swap the dials with those from a higher model with a tacho and it should work. They need to be from another Ph3 though or they won't work. Ph1/Ph2 dials are a no go.
You could get hold of a set of proper RS clocks and swap them over, not guarantee but it shuold give you the trip computer as long as you have the button the end of the stalk. The only expense would be getting the miliage corrected to match the old clocks.
There were a few cars on a 52 plate that were fitted with the wrong dials which along with being sans trip computer, only have a 7k rev counter and speedo up to 140mph. Also don't have the silver surround and red needles.
Do they look like this...
You'll need a press to get the old ones out (if not new discs) and to get the new ones in. The saxo vts/vtr uses the same(ish) rear brake setup so they should be the right ones.
Nah the other ones, just the single electrode. Although i've used super 4s before and never had a problem. Sticking with proper NGKs in the 172 though ;).